Very close to 7828, VV560 and R22 & R25 which all work in the .257 WB so worth a try. I would see if you can calculate the approximate loads based on 7RM data from Alliant. Should be 95% of the 7RM or thereabouts.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli